ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Kun-Hao Liang,Zhong-Wu Lu,Cai-Xia Ren,Jie Wei,Da-Wei Fang
As an improvement on imidazolium amino acid ionic liquids, three ionic liquids, 1-ethyl-4-butyl-1,2,4-triazolium acetylglycine [Taz(2,4)][Acgly], 1-ethyl-4-butyl-1,2,4-triazolium acetylalanine [Taz(2,4)][Acala], and 1-ethyl-4-butyl-1,2,4-triazolium acetylcysteine [Taz(2,4)][Accys], were first synthesized for future application as heat-transfer media. The density, surface tension, isobaric heat capacity, and thermal conductivity were measured in different experimental temperature ranges. Based on the above experimental data, the isobaric thermal expansibility and isentropic and isothermal compressibility, as well as the isochoric heat capacity and heat-storage density, were also calculated. Compared with several popular commercial heat-transfer fluids, it was found that the ionic liquids studied in this work have better performance in terms of heat-storage density of ∼2.38 MJ·cm–3·K–1 and thermal conductivity of ∼0.197 W·m–1·K–1. In addition, the viscosity was also determined, and the results showed an unexpected reduction by the introduction of a small amount of water for ionic liquids and almost no influence on other thermophysical properties. Finally, we selected a specific heat-transfer process and calculated the heat-transfer coefficient and the heat-transfer area based on the thermophysical properties. Meanwhile, the lower liquid temperature limit (∼229 K) and the nontoxic, environmentally friendly anion could provide a wider and safer environment for the application of ionic liquids. Given this, the ionic liquids studied in this work, especially the [Taz(2,4)][Acgly], could be considered as promising heat-transfer fluid candidates by appropriate adjustment of the water content.
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DOI
高影响因子
JOURNAL OF STRUCTURAL CHEMISTRY
·
2018
·Vol. 59
·期 3
·744-747
·
IF 0.521
Sun S.-W.,Wang G.-F.
The synthesis of a novel Cu(I) complex with V-shaped bidentate ligands {[Cu(BIPMO)]×[CuBr 2 ]} n where BIPMO = bis(4-(1 H -imidazol-1-yl)phenyl)methanone is reported. It is characterized by IR spectroscopy, elemental analysis, and single crystal X-ray diffraction. Copper(I) ions in the complex are in a distorted environment in which donor atoms are provided by the bromide anion and nitrogen atoms of BIPMO ligands, respectively. Infinite anion chains formed by CuX 4 (X = Br or N) polyhedra are linked by BIPMO ligands to give rise to layers. Furthermore, the layers are linked into 3D networks through weak intermolecular interactions.
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高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 49
·期 12
·3743-3749
·
IF 4.052
Ruling Tang,Chunli Hu,Jianghe Feng,Zhi Fang,Yan Chen,Fang Kong,Jianggao Mao
Two new inorganic metal borate derivatives, Sr5TeO2(BO3)4 and NaSr5(BO3)(SiO4)2, have been obtained through a high temperature solid reaction method. Sr5TeO2(BO3)4 crystallizes in a tetragonal space group of P4/mnc featuring a three-dimensional (3D) structure composed of a porous 3D strontium framework stabilized by the unique zero-dimensional (0D) [TeO2(BO3)4]10− anions. NaSr5(BO3)(SiO4)2 crystallizes in a monoclinic space group of P21/c with a 3D structure consisting of a splendid strontium 3D framework strengthened by isolated BO3 and SiO4 groups. The sodium cations located in the empty space of the structure. Thermal stability analyses, optical property measurements and theoretical studies of the compounds were performed. Refractive index calculations revealed that the birefringence of Sr5TeO2(BO3)4 and NaSr5(BO3)(SiO4)2 is 0.048 and 0.029, respectively, at 1064 nm.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Muhammad Yasir Nawabi,Waqar Uddin,Gang Hu,Saif Ullah,Zhaohui Fang,Saira Sardar
In this article, we presented an innovative work of distinguishing the two different positional heterosubstituents-aromatic isomers i.e. 4-hydroxycoumarin (4-HC) and 7-hydroxycoumarin (7-HC) on their perturbation effect by a novel analytical Belousov-Zhabotinskii (BZ) oscillator. In such BZ oscillator, the tetra-aza-macrocyclic copper complex ([CuL](ClO4)2) was used in which the ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraeazacyclotetradeca-4,11 diene. Experimental data confirmed that, by discrete injection of these two isomers (4-HC and 7-HC) into the active BZ system with equal concentrations reflected in their inhibition time (t in ), but the tin produced by 4-HC was higher than the tin initiated by 7-HC. The interesting feature is that, with increasing concentrations (9.0 x 10 -5 to 3.6 x 10 4 ) of 4-HC constantly increase the tin and decreased the oscillation number (N) after the regeneration of oscillation. Whereas, the upsurge concentrations of 7-HC didn’t change the tin but reduced the N after regeneration of oscillation. Thus, the two isomers were identified. Based on the mechanistic approach of FKN (Field-Koros-Noyes) model, the reaction perturbation mechanism was discussed. A fleeting description is that both 4-HC and 7-HC isomers were oxidized by BrO 2 intermediate radical (which produce during the course of reaction) into salicylic acid and quinone respectively and the system was temporary freeze (t in ) as well. The products (salicylic acid and quinone) were identified by infra-red and Ultra-Visible spectroscopies.
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高影响因子
ACS Biomaterials Science & Engineering
·
2017
·
IF 3.234
Ying Hao,Jinrong Peng,Yaguang Zhang,Lijuan Chen,Feng Luo,Cheng Wang,Zhiyong Qian
Breast cancer has been the first killer among women. In this study, combretastatin A-4 (CA-4) loaded 5-amino acid peptide Ala-Pro-Arg-Pro-Gly (APRPG) modified PEG-PDLLA mixed micelles was developed to target tumor neovasculature for breast cancer therapy. CA-4 is an effective vascular disrupting agent. The APRPG-modified PEG-PDLLA polymer was successfully synthesized and thin-film hydration method was used to prepare APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles. Drug loading capacity (DL), encapsulation efficiency (EE), and the optimized ratio of APRPG-PEG-PDLLA: MPEG-PDLLA for efficient drug loading was investigated. The particle size, zeta potential, morphology, and the crystallographic study were carried out to characterize the micelles. In vitro release study revealed a sustained release of CA-4 from the mixed micelles while compared to free CA-4. Moreover, the cytotoxicity data of blank and drug loaded mixed micelles suggested that the APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles were safe drug carriers and the encapsulated CA-4 remained potent antitumor effect. The cellular uptake study and the in vivo imaging and biodistribution study demonstrated that the APRPG peptide modified mixed micelles has the higher cellular uptake efficiency and could significantly facilitate the accumulation at tumor site. Furthermore, the micelles were slowly extravasated from blood vessels and inhibited embryonic angiogenesis in the transgenic zebrafish model. Consequently, the CA-4 loaded APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles group demonstrated a significant inhibition of tumor growth in 4T1 breast cancer model. In short, the CA-4 loaded APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles might have great potential for breast cancer therapy.
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高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 7
·2197-2203
·
IF 4.831
Hao Tongfan,Wei Xiao,Nie Yijing,Xu Yeqing,Yan Yongsheng,Zhou Zhiping
We on report an eco-friendly molecularly imprinted material based on carbon dots (C-dots) via a facile and efficient sol–gel polymerization for selective fluorescence detection of 4-nitrophenol (4-NP). The amino-modified C-dots were firstly synthesized by a hydrothermal process using citric acid as the carbon source and poly(ethyleneimine) as the surface modifier, and then after a sol–gel molecular imprinting process, the molecularly imprinted fluorescence material was obtained. The material (MIP-C-dots) showed strong fluorescence from C-dots and high selectivity due to the presence of a molecular imprint. After the detection conditions were optimized, the relative fluorescence intensity (F 0 /F) of MIP-C-dots presented a good linearity with 4-NP concentrations in the linear range of 0.2 − 50 μ mol L -1 with a detection limit (3σ/k) of 0.06 μmol L -1 . In addition, the correlation coefficient was 0.9978 and the imprinting factor was 2.76. The method was applicable to the determination of trace 4-NP in Yangtze River water samples and good recoveries from 92.6–107.3 % were obtained. The present study provides a general strategy to fabricate materials based on C-dots with good fluorescence property for selective fluorescence detection of organic pollutants.
An eco-friendly molecularly imprinted fluorescence sensor based on carbon dots (C-dots) (poly(ethyleneimine) (PEI) as the surface modifier) was prepared via a facile and efficient sol–gel polymerization (3-aminopropyltriethoxysilane (APTES) as the functional monomer and tetramethoxysilane (TEOS) as the cross linker) for selective fluorescence detection of 4-nitrophenol (4-NP).
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6513-6519
·
IF 3.849
Yuhang Wu,Congyan Li,Kaiwen Zhou,Yanhong Zhao,Xiaojing Wang
A novel catalyst, CeO2@Ag/Ag2Ta4O11, was successfully assembled via an in situ catalytic process for 4-nitrophenol reduction. As-prepared samples were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The results showed the elementary substance Ag was produced from Ag2Ta4O11 after a circular reduction reaction and was homogeneously deposited on the surface of Ag2Ta4O11 nanoparticles, which were wrapped by octahedron-shaped CeO2. The as-prepared nanocomposites exhibited extremely accelerated catalytic activity toward the efficient reduction of 4-nitrophenol compared to pure CeO2 and Ag2Ta4O11 nanoparticles. 15 rounds of recycling experiments confirmed that the samples exhibited good reuse stability, assigned to the confined robust shield of CeO2. The shell of CeO2 efficiently prevented undesirable aggregation and leaching of Ag nanoparticles. The persistent ascending activity with an increasing number of experimental runs was related to the amount of metallic Ag gradually growing. Moreover, it was proposed that the active interfacial contact between ceria oxide/metallic Ag/the semiconductor Ag2Ta4O11 (CeO2@Ag/Ag2Ta4O11) in the core–shell structure facilitated the transfer of electrons, contributing to the enhanced activity.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 6
·3389-3406
·
IF 6.123
Lang Daning,Xu Xia,Wu Ronglan,Wang Wei,Shi Ming,Jia Ke,Chen Shifei,Wang Jide
A cellulosic material has been synthesized that could efficiently and selectively adsorb organic and inorganic contaminants from aqueous solutions without interference from competing adsorption sites. Cellulose-graft-tetraethylenepentamine molecular imprinted polymer (C-TEPA-MIP) was synthesized by using 4-nitrophenol (4-NP) as the template. The C-TEPA-MIP adsorbent could adsorb 4-NP and Cr(VI) simultaneously and selectively, without being affected by the competitive adsorption sites of each of these pollutants. The adsorption of 4-NP was predominantly due to the imprinted sites of 4-NP in C-TEPA-MIP that were located inside of the adsorbent, whereas that of Cr(VI) was primarily due to the amine groups of TEPA found on the surface of the adsorbent. Compared with the non-imprint polymer synthesized without the template, C-TEPA-MIP showed higher selectivity for both 4-NP and Cr(VI) in unitary and binary systems. In addition, C-TEPA-MIP exhibited good stability and recyclability for 4-NP, which makes it a promising candidate material for applications concerning wastewater treatment. Graphical abstract
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2010
·
IF 4.144
Lejin Xu,Jianlong Wang
The removal of biocide 4-chloro-3-methyl phenol (CMP) was investigated by heterogeneous Fenton-like system using nanoparticulate zero-valent iron (nZVI) as catalyst. The properties of nZVI before and after reaction were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of pH value, initial concentration of CMP, nZVI dose and hydrogen peroxide (H 2 O 2 ) concentration were determined. The experimental results showed that lower pH value and CMP concentration brought faster degradation rate. With the initial pH value of 6.1 and initial CMP concentration of 0.7 mM, the optimal dosage of reagents were 0.5 g nZVI/L and 3.0 mM H 2 O 2 . At pH 6.1, the degradation of CMP followed two-stage first-order kinetic that composed of an induction period (first-stage) and a followed rapid degradation stage (second-stage). According to the effects of scavengers n -butanol and KI, hydroxyl radicals ( OH), especially the surface-bounded •OH, had a dominant role in the oxidation of CMP. The degradation intermediates, carboxylic acids and chloride ion produced during the reaction process were monitored by high performance liquid chromatography (HPLC), liquid chromatography/mass spectrometry (LC/MS) and ion chromatography (IC). On the basis of these findings, the possible mechanistic steps of CMP degradation were proposed.
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高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2013
·Vol. 30
·期 6
·294-301
·
IF 1.154
Lejin Xu,Jianlong Wang
Degradation of 4-chloro-3,5-dimethylphenol (PCMX) by a heterogeneous Fenton-like process using nanoparticulate zero-valent iron (nZVI) and hydrogen peroxide (H2O2) at pH 6.3 was investigated. Interactive effects of three factors—initial PCMX concentration, nZVI dosage, and H2O2 concentration—were investigated using the response surface method based on the Box–Behnken design. Experimental results showed that complete decomposition of PCMX and 65% of total organic carbon removal were observed after 30 min of reaction at neutral pH under recommended reaction conditions: nZVI, 1.0 g/L; H2O2, 18 mM; and initial PCMX concentration, 0.15 g/L. Based on the effects of scavengers n-butanol and KI, removal of PCMX was mainly attributed to the attack of •OH, especially the surface-bonded •OH. A possible degradation pathway of PCMX was proposed.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Man Cai,Zheng Xing,Chen Du,Xinyu Ding,Mengyu Zhang,Chengjin Zhou
The ecological risks brought by heavy metals and 4-monobromodiphenyl ether (BDE-3) copollutants are among the most common environmental contaminants. Heavy metals and other substrates are actively transported across cellular membranes by an ATP-binding cassette (ABC) transporter. Previous studies have suggested that phyllospheric yeast (Wickerhamomyces anomalus) can survive in BDE-3 and heavy metal environments. However, the underlying molecular mechanisms of BDE-3 and heavy metal tolerance are not clear. To assess the impact of the yeast transporter pdr15 gene on plant tolerance, tissue heavy metal levels, and BDE-3 levels, we heterologously expressed the gene in tobacco. Accumulating evidence has suggested that transgenic tobacco contributes to the reduction of plant damage by resulting in heavy metals and BDE-3 in specific subcellular organelles. Dimethyl ether and phthalic acid metabolism were the two main metabolic pathways for the toxicity-reducing effect. Our findings broaden the understanding of ABC transporter function and their regulatory metabolic pathways in heavy metal and BDE-3 co-contaminated resistance.
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiaofang Liu,Jiaxin Yi,Wenya Ma,Min Fan,Qingfeng Dong,Kunpeng Qian,Li Li
The gas permeability of packaging films significantly impacts the micro-environment and postharvest quality of fruits and vegetables. By regulating gas permeability to regulate the internal atmospheric composition of packaging, this method modulates the respiratory intensity and physiological metabolism of fruits and vegetables, thereby extending their postharvest shelf life. In this study, different proportions of Poly(lactic acid) (PLA)/Poly(3-hydroxybutyrate- co -4-hydroxybutyrate) (P34HB) composite films were prepared using the melt blending method, aiming to optimize the packaging microenvironment by adjusting the gas permeability of the films. The results indicate that the oxygen transmission rate of the composite film at a PLA/P34HB ratio of 20:80 was measured at 628.65 ± 7.2 cm 3 ·m −2 ·24 h −1 ·0.1 MPa, which was 90.98 % higher than that of the PLA film. The Pearson heatmap further confirmed that the permeability of the composite film had a significant impact on the preservation effect of peaches, while the influence on mechanical properties was not significant. This finding was corroborated by preservation experiments using films of different compositions, which demonstrated that the PLA20:80P34HB composite film performed the best. Specifically, it effectively slowed the loss of free water, thereby maintaining moisture content, total soluble solids content, and weight, ultimately extending the shelf life by 66.67 %.
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PubMed
高影响因子
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